ASoC: simple-card-utils: Avoid NULL deref in asoc_simple_set_tdm()

Don't dereference simple_dai before it has been checked for NULL.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Fixes: 1e974e5b

 ("ASoC: audio_graph_card2: Add support for variable slot widths")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20220404113252.1152659-1-rf@opensource.cirrus.com


Signed-off-by: Mark Brown <broonie@kernel.org>